Research on Exergy Flow Analysis and Operation Optimization of Integrated Energy System

Abstract

The integrated energy system (IES) is crucial for enhancing energy efficiency and promoting sustainable development. However, studies on exergy changes within these systems are limited. This study establishes a power flow model for IES based on multi-energy coupling laws. And employing the Newton-Raphson method for solution. Moreover, an exergy flow analysis approach for IES is proposed to address the inadequacies of conventional exergy analysis. To confirm the accuracy and adaptability of the suggested method, an example is constructed in accordance with the usual integrated energy system structure. The exergy loss is tantamount to the gap between the exergy flow of input and outflow nodes, which is consistent with Kirchhoff's law (KL). Similar conclusions can be derived from the analysis of other nodes in the system. Simulation results indicate that the proposed method effectively characterizes the distribution of exergy flow within an integrated energy system. Overall and local exergy efficiency of the system can both be expressed using the exergy flow distribution. To perform multi-objective optimization for the system, exergy efficiency and conventional indicators are combined. This method can evaluate the system performance more comprehensively, reveal the system defects that have not been detected by traditional indicators.

Keywords: Integrated energy system, power flow calculation, exergy flow analysis, particle swarm optimization